1 files changed, 97 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
new file mode 100644
index 000000000000..841a305d7948
--- /dev/null
+++ b/fs/nfsd/nfs4recover.c
@@ -0,0 +1,97 @@
+/*
+*  linux/fs/nfsd/nfs4recover.c
+*
+*  Copyright (c) 2004 The Regents of the University of Michigan.
+*  All rights reserved.
+*
+*  Andy Adamson <andros@citi.umich.edu>
+*
+*  Redistribution and use in source and binary forms, with or without
+*  modification, are permitted provided that the following conditions
+*  are met:
+*
+*  1. Redistributions of source code must retain the above copyright
+*     notice, this list of conditions and the following disclaimer.
+*  2. Redistributions in binary form must reproduce the above copyright
+*     notice, this list of conditions and the following disclaimer in the
+*     documentation and/or other materials provided with the distribution.
+*  3. Neither the name of the University nor the names of its
+*     contributors may be used to endorse or promote products derived
+*     from this software without specific prior written permission.
+*
+*  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+*  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+*  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+*  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+*  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+*  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+*  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+*  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+*/
+
+
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/nfs4.h>
+#include <linux/nfsd/state.h>
+#include <linux/nfsd/xdr4.h>
+#include <asm/uaccess.h>
+#include <asm/scatterlist.h>
+#include <linux/crypto.h>
+
+
+#define NFSDDBG_FACILITY                NFSDDBG_PROC
+
+static void
+md5_to_hex(char *out, char *md5)
+{
+        int i;
+
+        for (i=0; i<16; i++) {
+                unsigned char c = md5[i];
+
+                *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
+                *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
+        }
+        *out = '\0';
+}
+
+int
+nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
+{
+        struct xdr_netobj cksum;
+        struct crypto_tfm *tfm;
+        struct scatterlist sg[1];
+        int status = nfserr_resource;
+
+        dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
+                        clname->len, clname->data);
+        tfm = crypto_alloc_tfm("md5", 0);
+        if (tfm == NULL)
+                goto out;
+        cksum.len = crypto_tfm_alg_digestsize(tfm);
+        cksum.data = kmalloc(cksum.len, GFP_KERNEL);
+        if (cksum.data == NULL)
+                goto out;
+        crypto_digest_init(tfm);
+
+        sg[0].page = virt_to_page(clname->data);
+        sg[0].offset = offset_in_page(clname->data);
+        sg[0].length = clname->len;
+
+        crypto_digest_update(tfm, sg, 1);
+        crypto_digest_final(tfm, cksum.data);
+
+        md5_to_hex(dname, cksum.data);
+
+        kfree(cksum.data);
+        status = nfs_ok;
+out:
+        if (tfm)
+                crypto_free_tfm(tfm);
+        return status;
+}